| 6F40: reference: Molecular mechanism of promoter opening by RNA polymerase III., Vorlander MK, Khatter H, Wetzel R, Hagen WJH, Muller CW, Nature. 2018 Jan 17;553(7688):295-300. doi: 10.1038/nature25440. PMID: 29345638 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).